title: Coordination equilibria between seven- and five-coordinate iron(II) complexes.
abstract: Octahedral, tetrahedral, and square planar geometries are the most often encountered coordination geometries for transition metal complexes. In certain cases, coordination equilibria can exist between different geometries, such as between six- and four-coordinate geometries in nickel(II) complexes, which were discovered half a century ago. Here, we present the first examples of a seven-five coordination equilibrium. Extensive spectroscopic studies in solution have provided evidence for a dynamic equilibrium between two iron(II) complexes, one with a seven-coordinate pentagonal bipyramidal geometry and one with a five-coordinate trigonal bipyramidal geometry.
authors.affiliation: Department of Chemistry, Imperial College London , Exhibition Road, London, SW7 2AY, U.K.
authors.forename: Michaela
authors.initials: M
authors.lastname: Grau
authors.forename: Jason
authors.initials: J
authors.lastname: England
authors.forename: Rafael
authors.initials: R
authors.lastname: Torres Martin de Rosales
authors.forename: Henry S
authors.initials: HS
authors.lastname: Rzepa
authors.forename: Andrew J P
authors.initials: AJ
authors.lastname: White
authors.forename: George J P
authors.initials: GJ
authors.lastname: Britovsek